Diversified Electronics SP-0133 Under Frequency Monitor

The Diversified Electronics SP-0133 Under Voltage and Under Frequency Monitor is a protection relay designed to signal and switch circuits when incoming power deviates from nominal. Powered from 120 VAC, this unit offers a 10 A contact rating for its outputs, enabling control of loads such as relays, alarms, or interlocks in electric panels when undervoltage or under-frequency conditions are detected. The SP-0133 provides adjustable under-voltage thresholds, with setpoints configurable from 50% to 90% of nominal, allowing customization to the specific power quality tolerance of the installation. In addition to undervoltage protection, it functions as an under-frequency monitor, helping operators identify power-supply issues that can accompany frequency deviations. This model is intended for industrial applications where reliable, codified protection against low voltage and low frequency is important for protecting equipment and ensuring safe shutdown or alarm signaling in control panels.